x component = magnitude * cos theta, Y component = magnitude * sin theta

Vector magnitude = sqrt(3.464^2+16^2) =16.37071 = 16.4

Angle = tan -1 ( 16/3.4641) = = 77.80

Answer: 16.4 : 77.80 ; option A

Reference:

https://answers.yahoo.com/question/index?qid=20091016203908AAiGHiu

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